Holmberg was simply making a spot start, and will likely return to the Louisville rotation for the time being. He has been tagged for 11 runs in 5 1/3 innings in two appearances in the majors this season.
Corcino will be making his major-league debut the first time he appears in a game with the Reds. The 23-year-old has a 4.13 ERA In 143 2/3 innings at Double-A this season, and will likely serve as bullpen depth for the Reds.
Beltran had a cortisone injection in the elbow Wednesday, the team announced, and his status moving forward is expected to be determined Saturday.
Gentry has been out since late July with a hand injury, but just finished a rehab assignment at Triple-A Sacramento, where he hit .267 in four games.